. >> i went to one of the busiest airports in america, and you wouldn't believe there is a farm inside of it. [[voiceover]] every sunday night, al jazeera america presents gripping films from >> these vertical farms are everywhere. >> they're popping all over the world. and it's really exciting because it's going to change the way we eat and change the way we appreciate our food. check these out. they're called tower gardensers one of the many ways we can farm. food grows in them organically very quickly. there is water that flows through them. >> this is a great new way to grow produce. let's check it out. >> for over 8,000 years we've been plowing dirt to grow our food. in fact, we've gotten so good at it that 80% of the world's farmable land land. >> it would be easier if i showed you. let's pull this out. look at how healthy and strong these root systems are here. the water every 15 minutes is just washing over these roots. >> is it ready to be harvested? >> this is ready to be fully harvested for a restaurant or you could just start harvesting and eating it. >> delicious. >> we ha